Ambaguio, officially the Municipality of Ambaguio (Ilocano: Ili ti Ambaguio; Tagalog: Bayan ng Ambaguio), is a 5th class municipality in the province of Nueva Vizcaya, Philippines. According to the 2020 census, it has a population of 15,472 people.

The name "ambaguio" was from the word "bagiw," meaning "moss" which covered every inch of trees and stones in the area. The inhabitants were called "e-am-bagiw" meaning "conqueror of moss." The name underwent a series of changes due to its difficult pronunciation by the lowland people who later settled in the area, resulting in the present "Ambaguio."

A handful of settlers headed by Fausto Tagangtang who came from the neighboring Mountain Province first settled in the area, establishing farmed hills and rice terraces.

Due to its terrain, distance and road problems, the inhabitants were composed only of three major tribes: Igorot, Ifugao, and Ibaloi, who unanimously called the place “Ambaguio”, which means “the land of mosses”, and “its climate is similar to that of Baguio”.

Before its creation as a municipality, Ambaguio was then a barrio of the Municipality of Bayombong. Leonardo B. Perez, then Congressman of Nueva Vizcaya, authored the bill seeking for the creation of Ambaguio as an independent municipality. The bill was approved on 18 June 1966 by virtue of Republic Act. No. 4735. In the same year, Mariano L. Agnahe, the then Barrio Lieutenant, was appointed as the first mayor of the town.

Ambaguio is politically subdivided into 8 barangays. Each barangay consists of puroks and some have sitios.

Population census of Ambaguio

Year	Pop.	±% p.a.
1970	1,416	—
1975	3,000	+16.25%
1980	3,856	+5.15%
1990	7,241	+6.51%
1995	9,485	+5.19%
2000	9,750	+0.59%
2007	11,499	+2.30%
2010	13,452	+5.87%
2015	15,250	+2.42%
2020	15,472	+0.28%
Source: Philippine Statistics Authority

Poverty incidence of Ambaguio

10 20 30 40 50 60 2006 17.80 2009 15.50 2012 38.89 2015 23.90 2018 53.45 2021 19.95 Source: Philippine Statistics Authority

Ambaguio, belonging to the lone congressional district of the province of Nueva Vizcaya, is governed by a mayor designated as its local chief executive and by a municipal council as its legislative body in accordance with the Local Government Code. The mayor, vice mayor, and the councilors are elected directly by the people through an election which is being held every three years.

Members of the Municipal Council
(2022–2025)

Position	Name
Congressman	Luisa L. Cuaresma
Mayor	Ronelio B. Danao
Vice-Mayor	Leon M. Lino
Councilors	Mando B. Balaso
	Geraldo D. Lino
	Milany B. Emilio-Tidong
	Philip Ceasar A. Abiado
	Elias M. Wayas
	Decoran G. Allawas
	Felix O. Dinagwatan
	Ferdinand C. Balagsa

The Municipality of Ambaguio is famous for being a gateway to Luzon’s tallest peak, Mount Pulag.

In 2019, Violet Lucasi, a former employee of Etihad Airways opened Nueva Vizcaya (NV) Paragliding, which later became the Ambaguio Skyport, in Barangay Tiblac, attracting both local and foreign tourists. As the Philippines' first domestic paragliding "Airport terminal", this led to Ambaguio being awarded P25 million by the Department of Tourism's Tourism Champions Challenge on April 15, 2024. On April 30 however, the venue closed due to safety issues raised by authorities.

The Schools Division of Nueva Vizcaya governs the town's public education system. The division office is a field office of the DepEd in Cagayan Valley region. The office governs the public and private elementary and public and private high schools throughout the municipality.

• Philippine Standard Geographic Code
• Philippine Census Information
• Local Governance Performance Management System